Eeastus b



(Model.)

B. B. BARKER.

PHOTOGRAPHIG PLATE HOLDER.

Patented Mar. 28,1882.

ATTORNEYS.

single and double plate holders.

UNITED STATES PATENT OFFICE.

ERASTUS B. BARKER, OF NEW YORK, N. Y., ASSIGNOR TO E. T. ANTHONY & CO.,OF SAME PLACE.

PHOTOGRAPHlC-PLATE HOLDER.

SPECIFTCATION forming part of Letters Patent No. 255,566, dated March28, 1882, I Application tiled December- 31, l88l. (Model) To all whom itmay concern Be it known that I, ERASTUS B. BARKER, of the city, county,and State of New York,

have invented a new and Improved Photographic-Plate Holder, of which thefollowing is a full, clear, and exact description.

The object of my invention is to provide a plate-holder into which theslides or covers can be inserted or withdrawn either vertically orsidewise.

The invention consists in a photographicplate holder constructed withslide apertures or slots both at the sides and ends, whereby a slide maybe inserted either at the side or end of the plate-holder, as desired.

The invention also consists in a novel arrangement of the cut-offs andthe slides, where by the cut-ofi's serve to guide the slides, all ofwhich improvements will be carefully described.

My invention is equally applicable to both It will be herein shown asapplied with a double -plate holderthat is, a holder adapted to carrytwo sensitive plates.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view of my improved plate-holder, showing allthe slides or covers removed. Fig. 2 is a perspective view of the same,showing one of the vertical or side slides or covers partiallywithdrawn. Fig. 3 1s a perspective view, showing one of the end slidesor covers partially withdrawn. Fig. 4 is a sectional perspective view ofone corner ofthe plate-holder frame with the cut-otfstrip's. Fig. 5 is across-sectional elevation of a portion of the plate holder frame,showing the manner in which the cut-offs guide the slide moving in adirection parallel therewith.

The plate holder A is adapted to be used with a camera-boxin theordinary manner. It is also adapted to receive a septum, B, of theordinary construction, sliding in grooves O of the plate-holder frame.This septum is provided with an end stop, 0, provided at one end with astud, which is adapted to catch on a spring-catch, C of the plate-holderframe, and thus lock the septum in the plate-holder.

H, extending through the bar, and each con taining a cut-off, J. of theordinary construction. End slides, K,each provided at the outer end witha stop, L, are adapted to be passed sidewise through the slots E intothe plateholder, the longitudinal edges of the end slides being guidedin the slots H, and by the lower edges of the cut-off strips J, which atthe same time exclude the light at the upper longitudinal edge of theseend slides or covers.

Side slides or covers, M, each provided at the outer edge with a stop,0, are adapted to be passed through the slots H into the plateholder,the side edges of these side slides, M, being guided by the slots E andby the cut-off strips F. The end piece, D, and the bottom longitudinalbar, G, must be provided with grooves P and Q, coinciding with the slotsE and H. As the slots E and H are arranged along the edges of the frameof the plate-holder a slide can cover each face of the septum B, whichis between two slides; but a plate-holder with a single slide can alsobe constructed in the manner shown.

As may be desired, the end slides, K, or the side slides, M, can be usedwith the plate-holder, or an end slide, K, may cover one surface of theseptum and a side slide, M, may cover the other surface.

If the camera-box and the plate-holder A are adjusted with thelongitudinal axis in the horizontal plane, the end slides, K, are to beused,

as they can be withdrawn sidewise very conveniently. If the camera-boxand the plateholderA are adjusted with the longitudinal axis in avertical position, the side slides, M, are to be used, as they can bewithdrawn sidewise very conveniently when the camera-box standsvertically. Thus, if my improved plate-holder is used, the slides orcovers never need to be withdrawn vertically-that is, from the top ofthe camera. It is very ditficult to withdraw a slide or cover verticallyfrom a large camera, especially in the field and on a'windy day, andvery often the position of the camera is changed and the picture spoiledby the attempts to withdraw a large slide or coververtieall y. All thesedefects are avoided by my improved plateholder.

If the side slide, M, has been passed into the plate-holder in the darkroom, and if the end slide, K, is to be used, the slides can beconveniently changed in the field by placing the plate-holder upon thecamera-box, then closing the lens, and then withdrawing the side slideand replacing it by an'end slide, or, vice versa, an end slide can bereplaced by a side slide in the field in the manner described.

I do not limit or confine myself to the exactform or position of any ofthe parts herein mentioned, as they may be varied without departing frommy invention.

Having thus fully described my invention, 1 claim as new and desire tosecure by Letters Patent- 1. A photographic-plate holder made,substantially as herein shown and described, with slide apertures orslots both at the sides and ends, whereby a slide may be used either atthe side orend of the plate-holder, as described, and as set forth.

- 2. The frame of the plate-holder A, constructed with end apertures orslots, E, and grooves Q, for the reception of an end slide, K, and withside apertures or slots, H, and grooves P, for the reception of a sideslide, M, substantially as herein shown and described, and for thepurpose set forth.

3. The combination, in a photographic-plate holder, of an end cut-oftand slide and a side cut-off and slide, substantially as herein shownand described, and for the purpose set forth.

4. The combination, with a photographicplate holder provided with aslide-receiving slot which contains a cut-01f in one of the edges, of acut-oft at right angles to the slotted edge and parallel with thedirection of the movement of the slide, whereby the slide will be guidedby this cut-ofl' parallel with the direction of the movement of theslide, substantially as herein shown and described, and for the purposeset forth.

5. Ina photographic-plate holder, the combination of the followingelements, namely: agrooved and slotted frame with cut-oit's and slidesadapted to permit the insertion of a vertically-movable slide and ahorizontally-movable slide, substantially as herein shown and described,and for the purpose set forth.

6. In a photographic-plate holder, the combination of the followingelements, namely: a grooved and slotted frame with cut-offs and slidesadapted to admit the insertion of two vertically-movable slides and twolaterally-movable slides, substantially as herein shown and described,and for the purpose set forth.

7. In a photographic-plate holder, the combination of the followingelements, namely: a plate-holding septum, a grooved and slotted framewith cut-offs and slidesadapted to permit the insertion of avertically-movable and a horizontally-movable slide, substantially asherein shown and described, and for the purpose set forth.

ERASTUS B. BARKER.

Witnesses:

(J. Senewrorr, J. H. SCARBOROUGH.

